package com.heima.kafka.sample;

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;

import java.time.Duration;
import java.util.Collections;
import java.util.Properties;

/**
 * 消费者
 */
public class ConsumerQuickStart {
    public static void main(String[] args) {
        // 1. kafka的配置信息
        Properties properties = new Properties();
        // 链接地址
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"192.168.133.101:9092");
        // key 和 value 的反序列化器
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");
        // 设置消费者组
        properties.put(ConsumerConfig.GROUP_ID_CONFIG,"group1");
        // 手动提交偏移量
        properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);

        // 2. 创建消费者对象
        KafkaConsumer<String, String> consumer = new KafkaConsumer<>(properties);
        // 3. 订阅主题
        consumer.subscribe(Collections.singleton("itcast-topic-out"));
        // 4. 拉取消息
        // 同步提交和异步提交
        try{
            while (true) {
                ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
                for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                    System.out.println(consumerRecord.key());
                    System.out.println(consumerRecord.value());
                    System.out.println(consumerRecord.offset());
                    System.out.println(consumerRecord.partition());
                }
                // 异步提交偏移量
                consumer.commitAsync();
            }
        }catch (Exception e){
            e.printStackTrace();
            System.out.println("记录错误的信息：" + e);
        }finally {
            consumer.commitSync();
        }



//        while (true){
//            ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
//            for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
//                System.out.println(consumerRecord.key());
//                System.out.println(consumerRecord.value());
//                System.out.println(consumerRecord.offset());
//                System.out.println(consumerRecord.partition());
//            }
//
////            try{
////                // 同步提交偏移量
////                consumer.commitSync();
////            }catch (Exception e){
////                System.out.println("记录提交失败的异常" + e);
////            }
//
//
//            consumer.commitAsync(new OffsetCommitCallback() {
//                @Override
//                public void onComplete(Map<TopicPartition, OffsetAndMetadata> map, Exception e) {
//                    if (e != null){
//                        System.out.println("记录错误的提交偏移量：" + map + "异常信息为：" + e);
//                    }
//                }
//            });
//        }

    }

}
